diff --git a/start.letsencrypt.sh b/start.letsencrypt.sh
index 36d0f65..2b66499 100755
--- a/start.letsencrypt.sh
+++ b/start.letsencrypt.sh
@@ -22,41 +22,38 @@ start_letsencrypt() {
 	fi
 }
 
+check_new_cert() {
+
+	#DATE=$(date +%s)
+	if [[ -f /acme.sh/$DOMAIN/key.pem && -f /acme.sh/$DOMAIN/fullchain.pem && -f /acme.sh/$DOMAIN/cert.pem ]] ; then
+		#D1=$(date -r /acme.sh/$DOMAIN/fullchain.pem +%s)
+		#DIFF=$(expr $DATE - $D1);
+		#if [ $DIFF < 3600 ]; then touch /acme.sh/$DOMAIN/new_certificate; fi
+		NEW=$(openssl x509 -in /acme.sh/$DOMAIN/fullchain.pem -fingerprint -noout)
+		if [ "$ORIGINAL" !=  "$NEW" ]; then
+			touch /acme.sh/$DOMAIN/new_certificate;
+		fi
+	else
+		sending_error_msg $DOMAIN $DATE;
+	fi
+}
+
 LETSENCRYPT_FILE=$(find /acme.sh/ -type f -name letsencrypt);
 if [ -n "$LETSENCRYPT_FILE" ] ; then
 	DOMAIN=$(jq -r .DOMAIN $LETSENCRYPT_FILE) ;
-	DATE=$(date +%y%m%d%H)
-	echo $DATE
+	ORIGINAL=$(openssl x509 -in /acme.sh/$DOMAIN/fullchain.pem -fingerprint -noout)
 	start_letsencrypt;
 	rm $LETSENCRYPT_FILE;
-		
-		if [[ -f /acme.sh/$DOMAIN/key.pem && -f /acme.sh/$DOMAIN/fullchain.pem && -f /acme.sh/$DOMAIN/cert.pem ]] ; then
-		
-			if [[  "$(date -r /acme.sh/$DOMAIN/key.pem +%y%m%d%H)" -ge "$DATE" && "$(date -r /acme.sh/$DOMAIN/fullchain.pem +%y%m%d%H)" -ge "$DATE" && "$(date -r /acme.sh/$DOMAIN/cert.pem  +%y%m%d%H)" -ge "$DATE" ]] ; then
 
-				touch /acme.sh/$DOMAIN/new_certificate;
-			else
-				sending_error_msg $DOMAIN $DATE;
-			fi
-		fi
+	check_new_cert
 else 
 	cd /domains
 	for i in `ls` ; do
 		DOMAIN=$(jq -r .DOMAIN $i) ;
-		DATE=$(date +%y%m%d%H)
-		echo $DATE
+		ORIGINAL=$(openssl x509 -in /acme.sh/$DOMAIN/fullchain.pem -fingerprint -noout)
 		start_letsencrypt $DOMAIN;
-		
-		if [[ -f /acme.sh/$DOMAIN/key.pem && -f /acme.sh/$DOMAIN/fullchain.pem && -f /acme.sh/$DOMAIN/cert.pem ]] ; then
-		
-			if [[  "$(date -r /acme.sh/$DOMAIN/key.pem +%y%m%d%H)" -ge "$DATE" && "$(date -r /acme.sh/$DOMAIN/fullchain.pem +%y%m%d%H)" -ge "$DATE" && "$(date -r /acme.sh/$DOMAIN/cert.pem  +%y%m%d%H)" -ge "$DATE" ]] ; then
-			
-				touch /acme.sh/$DOMAIN/new_certificate;
-			else
-				sending_error_msg $DOMAIN $DATE;
-			fi
-	
-		fi
+
+		check_new_cert
 	done ;
 fi